摘要:
Use of a nitrate salt composition Z comprising Z1 at least one alkali metal nitrate and optionally alkaline earth metal nitrate and also Z2 at least one alkali metal nitrite and optionally alkaline earth metal nitrite in an amount of Z2 in the range from 1.1 to 15.0 mol % based on the sum of Z1 plus Z2 as heat transfer or heat storage medium in apparatuses in which these heat transfer or heat storage media are comprised at a temperature in the range from 500 to 620° C. and an oxygen partial pressure over the nitrate salt composition in the range from 0.1 to 1.0 atm, wherein the molar amount of the alkali metal nitrite and optionally alkaline earth metal nitrite for a desired temperature selected from the range indicated above and for a desired oxygen partial pressure selected from the range indicated above is calculated by means of the following formula x nitrite = K 6 ( T ) K 6 ( T ) + P O 2 where the variables have the following meanings: xnitrate is the mole fraction of nitrite in a nitrite/nitrate mixture, K6(T) is the temperature-dependent equilibrium constant of the reaction nitrate⇄nitrite+½ oxygen (NO3−⇄ NO2−+½ O2), pO2 is the oxygen partial pressure and T is the temperature of the nitrate salt composition, and the calculated value of the molar concentration of the component Z2 is optionally reduced by 40% or increased by 20% and the nitrate salt composition Z is heated to a maximum operating temperature in the range from 500 to 620° C. in the first start-up of said apparatuses.
摘要:
The present invention relates to a process for recovering 3-methylbut-3-en-1-ol from a feed stream F1 comprising 3-methylbut-3-en-1-ol, one or more solvents, water, and isobutene, wherein 3-methylbut-3-en-1-ol, the one or more solvents and water are separated from isobutene by distillation, the process comprising subjecting the feed stream F1 to distillation conditions in a distillation unit, obtaining a bottoms stream B1 which is enriched in -methylbut-3-en-1-ol, in the one or more solvents and in water compared to the feed stream F1 subjec The present invention relates to a process for recovering 3-methylbut-3-en-1-ol from a feed stream F1 comprising 3-methylbut-3-en-1-ol, one or more solvents, water, and isobutene, wherein 3-methylbut-3-en-1-ol, the one or more solvents and water are separated from isobutene by distillation, the process comprising subjecting the feed stream F1 to distillation conditions in a distillation unit, obtaining a bottoms stream B1 which is enriched in -methylbut-3-en-1-ol, in the one or more solvents and in water compared to the feed stream F1 subjected to distillation conditions, and a top stream T1 which is enriched in isobutene, further subjecting the bottoms stream B1 to distillation conditions in a second distillation unit and obtaining a bottoms stream B2 which is enriched in 3-methylbut-3-en-1-ol compared to the bottoms stream B1 and a top stream T2 which is enriched in water compared to the bottoms stream B1, further subjecting the bottoms stream B2 to distillation conditions in a third distillation unit and obtaining a top stream T3 which is enriched in 3-methylbut-3-en-1-ol compared to the bottoms stream B2 and a bottoms stream B3. ted to distillation conditions, and a top stream T1 which is enriched in isobutene, further subjecting the bot-toms stream B1 to distillation conditions in a second distillation unit and obtaining a bottoms stream B2 which is enriched in 3-methylbut-3-en-1-ol compared to the bottoms stream B1 and a top stream T2 which is enriched in water compared to the bottoms stream B1, further subjecting the bottoms stream B2 to distillation conditions in a third distillation unit and obtaining a top stream T3 which is enriched in 3-methylbut-3-en-1-ol compared to the bottoms stream B2 and a bottoms stream B3.
摘要:
The invention relates to a pipeline system for a linearly concentrating solar power plant (1) with at least one receiver line (13), in which a heat transfer medium is heated by radiating solar energy, or with a central receiver and at least one emptying tank (21) and/or one store for the heat transfer medium, the heat transfer medium having a vapor pressure of less than 0.5 bar at the maximum operating temperature. Furthermore, a gas displacement system (31) is comprised, which connects gas spaces in the at least one emptying tank (21) and/or in the store for the heat transfer medium to one another and which has a central gas store (35) and/or a central gas connection (37) and a central exhaust gas outlet (39), through which gas can be discharged into the surroundings.
摘要:
The presently claimed invention relates to a process for purification of aroma compounds by distillation. Specifically, it relates to a process for purification of carbonic esters of formula (I) using a combination of distillative processes.
摘要:
The present invention relates to a method for preparing compounds having a 16-oxabicyclo[10.3.1]pentadecene skeleton, specifically 14-methyl-16-oxabicyclo[10.3.1]pentadecenes, and conversion products thereof.
摘要:
A process for recovering isoprenol essentially free of formaldehyde from a stream of crude isoprenol containing isoprenol, water and formaldehyde, the process comprising subjecting the stream of crude isoprenol or an isoprenol containing fraction thereof to distillation in a low-boiler separation tower operated at a pressure of 2.5 bara or higher to obtain a distillate stream containing aqueous formaldehyde and a bottoms stream containing isoprenol. The process of the invention allows for obtaining isoprenol essentially free of formaldehyde. Further provided is a plant for recovering isoprenol essentially free of formaldehyde from a stream of crude isoprenol containing isoprenol, water and formaldehyde, the plant comprising a first low-boiler separation tower, a second low-boiler separation tower, and a finishing tower.
摘要:
The invention relates to a device for heat transfer, comprising a low temperature heat exchanger (3) and a high temperature heat exchanger (5), the heat exchangers (3, 5) being connected to one another by means of a connecting line such that a heat transfer medium flows through the high temperature heat exchanger (5) and through the low temperature heat exchanger (3) in succession, at least one dwell time tank (19) being arranged in the connecting line.
摘要:
The invention relates to a method for operating a linearly concentrating solar power plant (1), in which a heat transfer medium flows through a pipeline loop (47) having at least one receiver, the heat transfer medium having a flow velocity which is such that the flow in the pipeline loop (47) is turbulent, at least part of the heat transfer medium, upon exit from the pipeline loop (47), being extracted and recirculated into the pipeline loop (47). Furthermore, the invention relates to a linearly concentrating solar power plant with at least one pipeline loop (47) having at least one receiver in which a heat transfer medium flowing through the pipeline loop (47) is heated by irradiating solar energy, a mixing device (27) being comprised, in which at least part of the heat transfer medium flowing through the pipeline loop (47) is mixed with heat transfer medium to be delivered.
摘要:
The present invention relates to a process for preparing an unsaturated alcohol, preferably 3,7-dimethyl-2,6-octadienal, by contacting an alkene, preferably isobutene, with formaldehyde in the presence a condensation catalyst comprising a zeolitic material comprising the framework structure of which comprises a tetravalent element Y other than Si.
摘要:
The invention relates to a container for storing a liquid, which tends to decompose into gaseous decomposition components in the case of the conditions prevailing in the container (1) and in the case of which a chemical reaction equilibrium results between gaseous decomposition components and liquid, wherein a floating roof (29) is accommodated in the container (1) and the floating roof (29) comprises floats (33), using which the floating roof (29) floats on the liquid, and wherein the floating roof (29) is guided using a sliding seal (45) in the container (1).The invention furthermore relates to a device for storing heat, comprising a first container (57) for storing a colder liquid and a second container (59) for storing a hotter liquid and a use of the container and the device for storing heat.